I was really impressed that it seems to be doing everything locally in the browser, but I see once you start trying to do more complex visualizations it POSTs the dataset to the cloud. Still neat.
For now, I have some temporally solutions, setting a sample size is the easiest.
Another way is put some heavy computation tasks to scaleable OLAP services, like a clickhouse clusters.
I will continue to research more ways to make the client handle as much data as possible and fast enough so more people can deploy it by their own with few costs.